I was very lucky to get a lot of behind-the-scenes access to the presidency. And those pictures, I think, the whole reason to take them, is to show you something you might not be able to see in public: their sense of humor, their sensitivity, their anger, their abilities, how they relate to other people in a room, how they behave privately away from the lights and mikes.

Behind the scenes, I felt that I should be as discreet as possible. So, I used very quiet cameras. I never used strobe. I never engaged with the president when I was there.